Hi,
<http://tools.ietf.org/html/draft-ietf-iri-3987bis-01#section-3.4>:
Replace the ireg-name part of the IRI by the part converted using the
ToASCII operation specified in Section 4.1 of [RFC3490] on each dot-
separated label, and by using U+002E (FULL STOP) as a label
separator, with the flag UseSTD3ASCIIRules set to FALSE, and with the
flag AllowUnassigned set to FALSE. The ToASCII operation may fail,
but this would mean that the IRI cannot be resolved. In such cases,
if the domain name conversion fails, then the entire IRI conversion
fails. Processors that have no mechanism for signalling a failure
MAY instead substitute an otherwise invalid host name, although such
processing SHOULD be avoided.
In August, RFC 3490 has been obsoleted by RFC 5890/91.
What's the right reference for ToASCII now?
(This also affects draft-ietf-httpbis-state, I think).
Best regards, Julian